TW201433677A - Multi-stage telescopic arm device and deep-digging excavator comprising multi-stage telescopic arm device - Google Patents

Abstract

A telescopic arm (12), comprising an outer cylinder (13) and multiple stages of inner cylinders (21, 23), is provided on the distal end of a boom (4). The outer cylinder (13) is provided with a telescopic cylinder (25) and telescopic stationary sheave units (31, 31'). The telescopic cylinder (25) has a sheave mounting fixture (30) mounted thereon, and the sheave mounting fixture (30) is provided with telescopic movable sheave units (33, 33'). An expansion and contraction rope (34) is wound four times between each sheave (31A, 31B) of the telescopic stationary sheave unit (31) and each sheave (33A, 33B) of the telescopic movable sheave unit (33). An expansion and contraction rope (34') is wound four times between each sheave (31A', 31B') of the telescopic stationary sheave unit (31') and each sheave (33A', 33B') of the telescopic movable sheave unit (33').

Description

Multi-stage telescopic arm device and deep excavator with multi-stage telescopic arm device

The present invention relates to, for example, a multi-stage telescopic arm device suitable for ground deep excavation work in civil engineering and a deep excavation type excavator having a multi-stage telescopic arm device.

In general, in the case of deep excavation of the ground to form a vertical pit in civil engineering, a deep excavation type excavator is applied. The deep excavation type excavator includes a self-propelled vehicle body, a crane boom provided for the pitching motion of the vehicle body, and a plurality of telescopic arm devices provided on the front end side of the crane boom. The multi-stage telescopic boom device includes a telescopic arm having an outer cylinder extending in the vertical direction and a plurality of inner cylinders, a telescopic fixed sheave unit fixedly disposed on the outer cylinder, and a telescopic cylinder disposed along the longitudinal direction of the outer cylinder And a sheave attachment attached to the telescopic cylinder that is movable in the longitudinal direction of the outer cylinder, and the movable sheave unit for telescopic movement provided in the sheave attachment, one end side of which is locked to the outer cylinder and the other end side is locked The inner cylinder and the intermediate portion are wound around the telescopic fixing sheave unit and the telescopic cable for the telescopic movable sheave unit. In addition, a clamshell grab for earth and sand excavation is installed at the front end of the inner cylinder.

The deep excavation type excavator of the prior art is that the telescopic arm provided on the front end side of the crane boom is kept perpendicular to the ground, and the telescopic cylinder is reduced, whereby the inside of the telescopic arm can be made The barrel is extended downward from the outer tube. Therefore, the excavator can perform the excavation work of the soil sand using the clamshell type grab which is attached to the front end portion (lower end portion) of the inner cylinder.

After holding the earth sand excavated by the clamshell grab, the telescopic cylinder is extended, whereby the inner cylinder and the clamshell grab are pulled up into the outer cylinder by the telescopic cable. In this state, the excavator's upper revolving body is rotated toward a predetermined earthing position, and the clamshell type grapple is opened to perform the earthing operation of the excavated earth sand (refer to Patent Document 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 62-82131

However, in the above-described deep excavation type excavator, four sheaves that constitute the telescopic fixed sheave unit are attached to the outer cylinder of the telescopic arm, and a movable groove for telescopic expansion is attached to the sheave attachment. Four sheaves of the wheel unit. On the other hand, the telescopic cable has one end side that is locked to the outer tube, and the other end side of which is locked in the inner tube, and the middle portion of the telescopic cable is the four sheaves and the telescopic tube of the telescopic fixed sheave unit. Movable slot The four sheaves of the wheel unit are wound eight times in total.

Therefore, the telescopic cable must pass through the four sheaves of the fixed sheave unit for telescopic expansion and the four sheaves of the movable sheave unit for telescopic movement, so that it undergoes most of the repeated deflection and thus quickly becomes fatigued. As a result, a problem with the conventional excavation type excavator is that the frequency of replacement work of the telescopic cable increases. In addition, the deep excavation type excavator of the prior art has a large number of the sheaves that constitute the fixed sheave unit for expansion and contraction and the sheave that constitutes the movable sheave unit for expansion and contraction. Therefore, in order to extend the life of the telescopic cable. The diameter of each large sheave will result in an increase in the mass of each sheave. As a result, the mass of the entire telescopic boom increases, which may impair the stability of the excavator.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a multi-stage telescopic boom device which can be used to extend the life of a telescopic cable and a deep excavation type excavator including a multi-stage telescopic boom device.

(1) The multi-stage telescopic boom device according to the present invention is provided on the front end side of the crane boom provided on the object to be mounted, and extends in the vertical direction, and has an outer cylinder and is housed inside the outer cylinder. a telescopic arm of a plurality of inner cylinders that expand and contract in the longitudinal direction; a telescopic cylinder that is disposed along a longitudinal direction of the outer cylinder that constitutes the telescopic arm; and a fixed telescopic sheave that is fixedly disposed to the left and right of the outer cylinder a unit mounted on the telescopic cylinder and moving in a longitudinal direction of the outer cylinder so as to be close to or away from the telescopic fixed sheave unit; and provided in the sheave mounting device Left and right movable sheave units for telescoping; one of them The end side is locked to the outer cylinder, and the other end side thereof is an innermost inner cylinder that is locked in the inner cylinder, wherein the middle portion is wound around each of the telescopic fixed sheave units and the aforementioned telescopic It is constructed by the left and right telescopic cables of the movable sheave unit.

The present invention is characterized in that each of the telescopic fixed sheave units is composed of two sheaves, and each of the telescopic movable sheave units is composed of two sheaves, and each of the telescopic cables is Each of the above-described telescopic fixed sheave units and the above-described respective telescopic movable sheave units are wound four times.

According to this configuration, when the telescopic cylinder is contracted, the telescopic movable sheave unit supported by the sheave attachment moves upward, and approaches the telescopic fixed sheave unit that is fixed to the outer cylinder. Therefore, the telescopic cable wound around the sheave of the telescopic fixed sheave unit and the sheave of the telescopic movable sheave unit is released, and the inner cylinder is pulled out from the outer cylinder to the outside. Promote the extension of the telescopic arm. On the other hand, when the telescopic cylinder is extended, the telescopic movable sheave unit supported by the sheave attachment moves downward, and is separated from the telescopic fixed sheave unit fixed to the outer cylinder. Therefore, the telescopic cable is taken up between the sheave of the telescopic fixed sheave unit and the sheave of the telescopic movable sheave unit, and the inner cylinder is pulled into the outer cylinder, whereby The telescopic arm is reduced.

In this case, the telescopic cable is wound four times in total between the two sheaves that constitute the fixed sheave unit for expansion and contraction and the two sheaves that constitute the movable sheave unit for expansion and contraction. Therefore, for example, the telescopic cable shown in the prior art is configured to constitute four slots of the telescopic fixed sheave unit. When the wheel and the four sheaves that constitute the movable sheave unit for expansion and contraction are compared for the total of eight times of the structure, the number of times the telescopic cable can be flexed by the sheave can be halved, and the telescopic cable can be extended. life. Further, the number of the sheaves of the sheave of the telescopic fixed sheave unit and the movable sheave unit for expansion and contraction can be reduced, and thus the diameter of each sheave can be increased even in order to extend the life of the telescopic cable. Under the circumstance, the mass of the telescopic arm can be suppressed, and the stability of the multi-stage telescopic arm device can be ensured.

(2) According to the invention, the outer cylinder is provided with a crane boom bracket having a joint portion to which the crane boom is coupled, and is provided above the crane boom bracket with a space therebetween or a cylinder bracket that is connected to a swinging cylinder that can urge the swing arm to swing the crane boom; the telescopic cylinder has a pipe and one side of which is fixed to the piston in the pipe And the other side is a rod protruding from the pipe to the outside; one of the pipe and the rod is attached to the sheave attachment; the telescopic cylinder is arranged such that when it becomes the most reduced state, the pipe The end portion of one of the rod members is located above the joint portion of the bracket above the crane boom bracket and the cylinder bracket, and when it is in the most extended state, the pipe and the pipe are One of the ends of the rod is located below the joint portion of the bracket below the crane boom bracket and the cylinder bracket.

According to this configuration, as long as the telescopic cylinder is caused to expand and contract between the most reduced state and the most extended state, the end of one of the pipe and the rod to which the telescopic cylinder of the sheave attachment is attached will be a crane. The boom bracket and the cylinder bracket move up and down as a reference. In this manner, the telescopic cylinder is moved up and down with the crane boom bracket and the cylinder bracket as a reference, so that a large stroke of the telescopic cylinder can be obtained. Therefore, a larger digging depth can be ensured.

(3) According to the present invention, the telescopic cylinder is composed of a hydraulic cylinder having a pipe and a rod which is fixed to the piston in the pipe and whose other side is a rod protruding from the pipe to the outside. The length dimension from the bottom of the pipe to the front end portion of the rod when the telescopic cylinder is in the most reduced state is set to be approximately 1/2 of the length dimension of the outer cylinder.

According to this configuration, the telescopic cylinder can be maximally extended within the range of the length of the outer cylinder, so that the stroke of the telescopic cylinder can be set larger, and the larger amount of movement of the sheave attachment can be ensured. Therefore, if the telescopic cable is wound between the two sheaves of the telescopic fixed sheave unit and the two sheaves of the telescopic movable sheave unit, the telescopic boom can be expanded and contracted four times.

(4) According to the invention, the front end portion of the rod member of the telescopic cylinder is attached to the upper side of the outer cylinder in an upward state, and the sheave attachment is a pipe to be attached to the telescopic cylinder.

According to this configuration, the front end portion of the rod member of the telescopic cylinder is attached to the outer cylinder in an upward state. Therefore, when the expansion cylinder is caused to elongate, the pipe material and the sheave mounting device, which are themselves heavy objects, will move downward together, via the sheave and the telescopic fixed sheave unit that is wound around the movable sheave unit for telescopic movement. The steel cable for telescopic expansion of the sheave, the inner cylinder is placed inside the outer cylinder Pull up. At this time, the downward load generated by the weight of the pipe and the sheave mounting device acts on the moving pipe material below. Therefore, the weight of the pipe and the sheave mounting device can be utilized to increase the pulling-up force of the inner cylinder, and the pulling-up action of pulling up the inner cylinder by the telescopic cylinder can be performed efficiently.

(5) According to the present invention, each of the telescopic fixed sheave units is provided in the outer cylinder so as to be bilaterally symmetrical with respect to the telescopic cylinder, and each of the telescopic movable sheave units is spaced apart at intervals The above-described telescopic cylinder is provided on the sheave attachment in a bilaterally symmetrical manner, and each of the telescopic cables is wound around a sheave of the telescopic fixed sheave unit that is disposed on the left side with the telescopic cylinder interposed therebetween. The groove of the expansion/contraction fixed sheave unit and the groove of the expansion/contraction movable sheave unit that are disposed on the right side of the retractable fixed sheave unit with the telescopic cylinder interposed therebetween Between the rounds.

According to this configuration, a plurality of telescopic fixed sheave units, a telescopic movable sheave unit, and a telescopic cable are provided on the right and left sides in a bilaterally symmetric manner, so that the telescopic expansion can be reduced. Use the load on the cable. As a result, the life of the telescopic cable can be prolonged, and the telescopic operation can be performed stably for a long period of time. Further, even if one of the telescopic cables is broken, the other telescopic cable can be used to support the inner cylinder, so that the safety of the excavation work can be ensured.

(6) According to the present invention, the outer cylinder is provided on the outer side of the outer cylinder, and is disposed in parallel with the outer cylinder and extends in the longitudinal direction. The sheave mounting rail of the outer cylinder is configured to move along the sheave attachment rail in response to expansion and contraction of the telescopic cylinder.

According to this configuration, when the telescopic cylinder is used to move the sheave mounting device, the sheave mounting device is guided by the sheave mounting rail, and the moving rail can always be moved on a certain track. As a result, the telescopic cable that is wound around the sheave of the telescopic fixed sheave unit and the sheave of the telescopic movable sheave unit can smoothly and smoothly follow the movable sheave unit for telescopic support that is supported by the sheave attachment. The movement can improve the stability of the inner cylinder to the telescopic movement of the outer cylinder. Moreover, by using the sheave mounting rail provided on the outer cylinder, the strength of the outer cylinder can be increased, and the overall reliability of the telescopic arm can be improved.

On the other hand, the pipe to which the sheave mounting device is mounted is also moved along a sheave mounting rail and can be moved along a certain track. As a result, the strength of the telescopic cylinder against the frustration and the strength against the lateral load can be improved, and the reliability of the telescopic cylinder can be improved.

(7) According to the present invention, a pair of crane boom brackets are provided on the outer side of the outer cylinder than the groove wheel mounting device, and the pair of crane boom brackets are in the left-right direction. The surfaces of the telescopic cylinders are disposed so as to be slidable toward the front end side of the crane boom, and the pipes of the telescopic cylinders are disposed in a gap formed between the pair of crane boom brackets.

According to this configuration, the telescopic cylinder is disposed in a gap formed between one of the outer sides of the outer cylinder and the crane boom bracket, so that it can be directly visually observed from the side of the vehicle body on which the crane boom is installed: a cylinder, a sheave mounting device for a pipe that is mounted on a telescopic cylinder, and supported by a sheave mounting device The movable sheave unit for the expansion and contraction, and the telescopic cable for winding the telescopic fixed sheave unit and the movable sheave unit for expansion and contraction. In this way, the operator on the side of the vehicle body on which the crane boom is provided can perform the operation of causing the inner cylinder to expand and contract the outer cylinder while directly observing the telescopic cylinder or the like.

Further, in the outer cylinder, on the side opposite to the side on which the crane boom bracket is provided, that is, on the side opposite to the vehicle body provided with the crane boom, it is not necessary to provide expansion and contraction. Cylinder, fixed sheave unit for telescopic expansion, sheave attachment, and movable sheave unit for telescopic movement. Therefore, when excavation of a vertical pit or the like is performed, members such as the telescopic cylinders do not collide with an obstacle and are damaged, and the workability of the excavation work can be improved.

Further, in the case where the outer cylinder is placed on the ground in order to change the multi-stage telescopic arm device into the conveying posture, the surface opposite to the side on which the crane boom is attached can be placed on the ground. In this way, when the outer cylinder is placed on the ground, it is not necessary to use an additional mounting table or the like, and the telescopic cylinder, the sheave mounting device, the telescopic fixed sheave unit, the telescopic movable sheave unit, and the like can be kept at all. The weight of the telescopic arm acts on the upward facing posture of the body.

Therefore, in a state in which the multi-stage telescopic arm device is converted into the transport posture, the telescopic cylinder attached to the outer cylinder, the telescopic fixed sheave unit, the sheave attachment, and the movable groove for expansion and contraction can be executed at a position close to the ground. The maintenance work of the wheel unit, etc., can improve the workability of such maintenance work.

(8) According to the invention, a pipe guide member is provided on the outer side of the outer cylinder, and the pipe guide member accommodates the pipe of the telescopic cylinder so that the pipe can move, and the pipe is outside the foregoing Guided by the length of the barrel.

According to this configuration, the free end side of the pipe material of the telescopic cylinder is guided by the pipe guide in the longitudinal direction of the outer cylinder, whereby the pipe to which the sheave attachment is attached can be smoothly and smoothly moved. Therefore, the tubing of the telescopic cylinder can be moved along a pipe guide on a certain track, and the strength of the telescopic cylinder against the frustration and the strength against the lateral load can be improved. Further, by accommodating the pipe in the pipe guide, the pipe can be protected from falling stones or the like when excavating.

(9) According to the invention, the outer cylinder is formed in a rectangular tubular shape having a polygonal cross-sectional shape, and the polygonal cross-sectional shape has at least a side surface which is attached to the front end side of the crane boom, and The rear side surface facing the front side in the front-rear direction, the left side surface and the right side surface facing each other in the left-right direction with the rear side surface and the front side surface interposed therebetween are obliquely inclined between the rear side surface and the left side surface a left inclined surface, a right inclined surface that is obliquely inclined between the rear side surface and the right side surface; and the expansion/contracting movable sheave unit is disposed in a left-right direction as compared with a left and right side surface constituting the outer cylinder On the outside.

According to this configuration, the outer cylinder is formed in a cylindrical shape having a polygonal cross-sectional shape, and is provided between the rear side surface and the left and right side surfaces which are attached to the front end side of the crane boom, and is provided with left and right sides. The inclined surface enhances the frustration strength against the load acting on the outer cylinder. Such a It can extend the life of the outer cylinder and improve the reliability of the telescopic arm.

Further, the movable sheave unit for expansion and contraction supported by the sheave attachment is disposed on the outer side in the left-right direction of the left and right side faces constituting the outer cylinder, whereby movement for expansion and contraction can be suppressed. The sheave unit protrudes largely toward the rear side surface side of the outer cylinder. As a result, even when a movable sheave unit for expansion and contraction composed of a large-diameter sheave is used, the circumference of the movable sheave unit for expansion and contraction can be reduced in size, so that a sheave having a large diameter can be used. The movable sheave unit for telescopic expansion can extend the life of the telescopic cable.

In this manner, the structure for extending the life of the telescopic cable can be made. Therefore, the load acting on the telescopic cable can be set to be larger. As a result, the capacity of the clamshell type grab that is attached to the inner cylinder connected to the telescopic cable can be increased, so that a large amount of soil sand can be excavated.

(10) According to the invention, the outer cylinder is formed in a rectangular tubular shape having a hexagonal cross-sectional shape, and the hexagonal cross-sectional shape is: a rear side surface mounted on a front end side of the crane boom, and The rear side surface facing the front side in the front-rear direction, the left side surface and the right side surface facing each other in the left-right direction with the rear side surface and the front side surface interposed therebetween are obliquely inclined between the rear side surface and the left side surface The left inclined surface is formed by a right inclined surface that is obliquely disposed obliquely between the rear side surface and the right side surface. In this way, the frustration strength against the load acting on the outer cylinder can be increased, and the life of the outer cylinder can be prolonged.

(11) According to the present invention, the first inner cylinder located at the outermost side among the outer cylinder and the inner cylinder of the plurality of sections is provided with: When the first inner cylinder is extended from the outer cylinder by the telescopic cylinder, the first inner cylinder can be pushed outward in an extending direction; the pushing mechanism is located at a lower side of the outer cylinder The left and right push-out fixing sheaves provided on the left and right sides of the outer cylinder are disposed at the lower side of the retractable movable sheave unit, and are provided on the left and right push-out movable sheaves of the sheave attachment, One end side is locked to the outer tube, and the other end side is locked to the first inner tube through the inner side of the outer tube, and the middle portion is wound around the left and right push-out fixing grooves, respectively. The wheel is formed by the left and right push-out steel cables for the left and right push-out movable sheaves; and the left and right push-out fixed sheaves are provided on the lower side of the outer cylinder, respectively. The slot for mounting the sheave is provided, and a part of the left and right pusher fixing sheaves is disposed inside the outer cylinder through the slot mounting opening.

According to this configuration, even if the diameter of the push-out fixing sheave is set to be large, the push-out fixing sheave can be tightly attached to the outer cylinder. As a result, the life of the push-out cable can be extended by using the large-diameter push-out fixed sheave.

Further, in comparison with the case where the push-out fixing sheave is disposed at the lower end portion of the outer cylinder of the prior art, when the first-stage inner cylinder is housed in the outer cylinder, the lower end portion of the outer cylinder can be reduced. The amount of protrusion of the lower end portion of the protruding first inner cylinder. As a result, the total length when the telescopic arm is in the most reduced state can be shortened, and for example, when the multi-stage telescopic arm device is transported, it can be formed into a compact transport posture.

(12) The deep excavation type excavator to which the present invention is applied is A self-propelled vehicle body, a crane boom provided on the vehicle body, and a plurality of telescopic arm devices disposed on a front end side of the crane boom, the multi-section telescopic arm device having: facing up and down An outer cylinder extending in a direction and a telescopic arm of an inner cylinder that is accommodated in the inner side of the outer cylinder and capable of expanding and contracting in a longitudinal direction; a telescopic cylinder disposed along a longitudinal direction of the outer cylinder constituting the telescopic arm; a left and right telescopic fixed sheave unit provided in the outer cylinder; a groove that is attached to the telescopic cylinder and moves in the longitudinal direction of the outer cylinder so as to be close to or away from each of the telescopic fixed sheave units a wheel mounting device; a left and right telescopic movable sheave unit mounted on the sheave attachment, one end side of which is locked to the outer cylinder, and the other end side of which is locked in the inner cylinder The inner tube located at the innermost side is formed by winding the left and right telescopic cables of the respective telescopic fixed sheave units and the respective telescopic movable sheave units.

Further, each of the telescopic fixed sheave units is composed of two sheaves, and each of the telescopic movable sheave units is composed of two sheaves, and each of the telescopic cables is stretched in the above-described respective telescopic The fixed sheave unit and the above-described respective movable sheave units for telescopic movement are wound four times.

According to this configuration, the telescopic cable is wound four times in total between the two sheaves of the telescopic fixed sheave unit and the two sheaves of the telescopic movable sheave unit. Therefore, in the above-described technique, the telescopic cable is wound eight times in total between the four sheaves that constitute the telescopic fixed sheave unit and the four sheaves that constitute the movable sheave unit for expansion and contraction. In comparison with the structure, the life of the telescopic cable can be extended. And by When the number of the sheaves for the telescopic fixed sheave unit and the telescopic movable sheave unit is reduced, even if the sheaves of the larger diameter are used to extend the life of the telescopic cable, the increase in the mass of the telescopic boom can be suppressed. Large to ensure the stability of the deep excavator.

2‧‧‧Lower driving body (body)

3‧‧‧Upper revolving body (body)

4‧‧‧ crane boom

12‧‧‧ Telescopic arm

13‧‧‧Outer tube

13A‧‧‧ rear side

13B‧‧‧ front side

13C‧‧‧Left side

13D‧‧‧ right side

13E‧‧‧Left inclined surface

13F‧‧‧Right slope

13G‧‧‧Upper

13H‧‧‧Bottom

16‧‧‧ Openings for sheave installation

17‧‧‧ Crane boom bracket

21‧‧‧The first inner tube

23‧‧‧The second inner cylinder

25‧‧‧ Telescopic cylinder

25A‧‧‧Tubing

25A1‧‧‧ bottom

25B‧‧‧ rods

25C‧‧‧ front end

26‧‧‧Tube guides

28‧‧‧Slotted wheel mounting rails

30‧‧‧Slot wheel mounting tools

31, 31'‧‧‧Fixed fixed sheave unit for telescopic

33,33'‧‧‧Removable sheave unit for telescopic

34, 34'‧‧‧ Telescopic cable

35, 35'‧‧‧Support fixed sheave

38, 38’ ‧ ‧ launch agency

39, 39'‧‧‧ Launched with fixed sheave

41, 41'‧‧‧ Launched with movable sheave

42, 42’‧‧‧ Launched steel cable

Fig. 1 is a side view showing a deep excavation type excavator according to an embodiment of the present invention in a state where the telescopic arm is most reduced.

Fig. 2 is a side view showing the excavator of the deep excavation in a state in which the telescopic arm is the longest.

Fig. 3 is a side view showing the multi-stage telescopic arm device of Fig. 1 in a single body.

Fig. 4 is a front elevational view of the multi-stage telescopic boom device viewed from the direction of arrows IV-IV in Fig. 3.

Fig. 5 is a perspective view showing a multi-stage telescopic arm device in a single unit.

Fig. 6 is an enlarged perspective view showing important parts of the outer cylinder, the telescopic cylinder, the telescopic fixed sheave unit, the sheave attachment, the telescopic movable sheave unit, and the sheave attachment rail in Fig. 5.

Fig. 7 is an enlarged perspective view showing important parts of the sheave attachment, the movable sheave unit for expansion and contraction, the movable sheave for push-out, and the guide rail of the sheave.

Fig. 8 is an enlarged front elevational view showing an important part of the expansion/contraction fixed sheave unit and the like in Fig. 4 .

Fig. 9 is a schematic view showing the telescopic mechanism of the telescopic arm in a reduced state of the telescopic arm.

Fig. 10 is a schematic view showing the telescopic mechanism of the telescopic arm in an extended state of the telescopic arm.

Fig. 11 is a cross-sectional view showing the telescopic boom, the crane boom bracket, and the like from the direction of the arrow XI-XI in Fig. 3.

Fig. 12 is a cross-sectional view showing the telescopic boom, the telescopic cylinder, the sheave attachment, the movable sheave unit for expansion and contraction, and the like from the direction of the arrow XII-XII in Fig. 3 .

Fig. 13 is a cross-sectional view showing the telescopic boom, the telescopic cylinder, the sheave attachment, the push-out movable sheave, and the like from the direction of the arrow XIII-XIII in Fig. 3 .

Fig. 14 is a cross-sectional view showing the telescopic boom, the sheave mounting opening, the push-out fixing sheave, and the like from the direction of the arrow XIV-XIV in Fig. 3 .

Fig. 15 is a side view showing a state in which the excavation type excavator is replaced with a conveying posture and the telescopic arm is placed on the ground.

Fig. 16 is a front elevational view showing a modification in which a telescopic cylinder, a telescopic fixed sheave unit, a sheave attachment, a telescopic movable sheave unit, a sheave attachment rail, and the like are disposed on the front side surface side of the outer cylinder.

Hereinafter, an embodiment of the deep excavation type excavator of the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, reference numeral 1 denotes a deep excavation type excavation of the present embodiment. The excavation type excavator 1 is a vehicle body including a crawler-type lower traveling body 2 that can be self-propelled, and a swingable upper revolving body 3 that is mounted on the lower traveling body 2. This vehicle body is an object to be attached to the multi-stage telescopic boom device 11 to be described later.

The upper revolving structure 3 is substantially composed of a swing frame 3A as a base, a cover 3B disposed on the left side of the front portion of the swing frame 3A, and a balance weight provided on the rear end side of the swing frame 3A. 3C, which is housed inside a casing cover 3D that is equipped with an engine, a hydraulic pump, etc. (all of which are not shown in the figure).

4 is a crane boom that can be used as a pitching motion provided on the front side of the upper revolving body 3. The base end side of the crane boom 4 is attached to the front side of the swing frame 3A, and a multi-stage telescopic boom device 11 to be described later is attached to the front end side of the crane boom 4. Between the crane boom 4 and the swing frame 3A, a crane boom cylinder 4A is provided, and by moving the crane boom cylinder 4A, the crane boom 4 performs a pitching operation with respect to the upper swing body 3. On the upper side of the crane boom 4, the bottom side of the excavating device swing cylinder 4B is attached, and the rod side of the excavating device swing cylinder 4B is attached to the multi-stage telescopic arm device 11.

Next, a multi-stage telescopic boom device 11 that is mounted on the front end side of the crane boom 4 for performing the excavation of the vertical pit in depth will be described.

11 is a multi-stage telescopic arm device that is attached to the front end side of the crane boom 4, and includes a telescopic arm 12, a telescopic cylinder 25, a sheave attachment 30, and a fixed sheave unit for expansion and contraction, which will be described later. 31. The movable sheave unit 33 for telescopic movement and the steel cable 34 for expansion and contraction Constituted.

Reference numeral 12 denotes a telescopic telescopic telescopic boom that is attached to the front end side of the crane boom 4 and that can extend in the vertical direction. As shown in FIG. 9 and the like, the telescopic arm 12 is configured such that the outer cylinder 13 positioned at the outermost side and the inner circumferential side of the outer cylinder 13 can be expanded and contracted in the longitudinal direction (moving) The one-stage inner cylinder 21 is housed in the inner peripheral side of the first-stage inner cylinder 21 and is configured to extend and contract in the longitudinal direction to the second inner cylinder 23 which will be described later.

Here, as shown in FIGS. 11 to 14, the outer cylinder 13 is provided with a rear side surface 13A attached to the front end side of the crane boom 4 and a rear side surface 13A spaced apart from each other in the front-rear direction. The front side surface 13B facing the front side, the left side surface 13C and the right side surface 13D facing each other in the left-right direction with the rear side surface 13A and the front side surface 13B interposed therebetween, and the left side surface inclined obliquely between the rear side surface 13A and the left side surface 13C The inclined surface 13E is formed between the rear side surface 13A and the right side surface 13D so as to be obliquely inclined to the right inclined surface 13F. Therefore, the outer cylinder 13 as a whole is formed into a corner cylinder having a hexagonal cross-sectional shape.

Therefore, the outer cylinder 13 is provided between the rear side surface 13A and the left side surface 13C which are attached to the front end side of the crane boom 4, and is provided with a left inclined surface 13E, and is provided between the rear side surface 13A and the right side surface 13D. Right inclined surface 13F. As a result, the outer cylinder 13 constitutes a structure which can increase the frustration strength against the load acting on the outer cylinder 13. On the other hand, the upper end portion 13G and the lower end portion 13H of the outer cylinder 13 respectively form open ends.

The upper flange plate 14 is located in the longitudinal direction of the outer cylinder 13 The intermediate portion is integrally provided on the outer peripheral side of the outer cylinder 13. One end 42A of the push-out cable 42 to be described later is locked to the upper flange plate 14. On the other hand, the lower flange plate 15 is integrally provided at the lower end portion of the outer cylinder 13. One end 37A of the support cable 37 to be described later is locked to this lower flange plate 15.

On the lower side of the outer cylinder 13, left and right sheave mounting openings 16, 16' are provided. As shown in Fig. 14, the left-hand groove mounting opening 16 is formed at a portion where the left side surface 13C constituting the outer tube 13 and the left inclined surface 13E meet, and the right-hand groove mounting opening 16' is formed. A portion where the right side surface 13D of the outer cylinder 13 and the right inclined surface 13F meet. The sheave mounting openings 16, 16' are open to the inside of the outer cylinder 13, and the sheave mounting openings 16, 16' are inserted into a part of the push-out securing sheaves 39, 39' which will be described later.

Reference numeral 17 denotes a left and right pair of crane boom brackets provided on the outer side of the outer cylinder 13 at a lower portion of the sheave attachment 30 to be described later, and the pair of crane boom brackets 17 are mounted. On the front end side of the crane boom 4. Here, as shown in Fig. 5 and Fig. 11, a pair of crane boom brackets 17 are constituted by a plate body that faces each other with a space in the left-right direction, and a cylindrical crane crane Both sides of the arm connecting portion 17A in the left-right direction are fixed to the respective brackets 17. The pair of crane boom brackets 17 are integrally fixed to the rear side surface 13A of the outer cylinder 13 by means of fixing means such as welding, and the crane boom connecting portion 17A of the crane boom bracket 17 uses the bolt 18 (please refer to Fig. 1) is coupled to the front end side of the crane boom 4. In addition, in a pair of crane boom brackets A gap 17B is formed between the 17 and a telescopic cylinder 25 to be described later is disposed in this gap 17B.

19 is a pair of left and right cylinder cylinders provided on the outer side of the outer cylinder 13 at a higher side than the crane boom bracket 17, and the pair of cylinder brackets 19 are mounted on the excavating device. The rod side of the cylinder 4B is swung. Here, the pair of cylinder brackets 19 are formed of a plate body that faces at intervals in the left-right direction, and includes a cylinder connecting portion for connecting the rod end portion of the excavating device swing cylinder 4B. . The pair of cylinder brackets 19 are integrally fixed to the rear side surface 13A of the outer cylinder 13 by means of fixing means such as welding, and are located beside the upper side of the crane boom bracket 17, and the excavating device swings the rod of the cylinder barrel 4B. The front end portion is a cylinder connection portion rotatably coupled to the pair of cylinder brackets 19 by using a bolt 20 (refer to FIG. 1).

Therefore, when the excavating device swing cylinder 4B is expanded and contracted, the outer cylinder 13 of the telescopic boom 12 swings in the front-rear direction or the vertical direction around the plug 18 on the front end side of the crane boom 4. Further, the cylinder bracket 19 will sometimes be disposed at a lower position than the crane boom bracket 17 due to the difference in the mounting position of the excavating device swing cylinder 4B.

Reference numeral 21 denotes a first-stage inner cylinder which is movably accommodated at the outermost position while maintaining a proper gap with the inner side of the outer cylinder 13. As shown in FIGS. 11 to 14, the first stage inner cylinder 21 has a quadrangular cross-sectional shape surrounded by the rear side surface 21A, the front side surface 21B, the left side surface 21C, and the right side surface 21D. The inner cylinder 21 is formed as a whole The corner cylinders have open ends at both ends in the up and down direction. Further, the inner cylinder 21 is housed inside the outer cylinder 13 from the lower end portion 13H of the outer cylinder 13, and is movable in the longitudinal direction (vertical direction) with respect to the outer cylinder 13.

Here, between the inner side surface of the outer cylinder 13 and the outer side surface of the first inner cylinder 21, a sliding plate (not shown) is provided for making the inner cylinder 21 smoothly and smoothly along the outer cylinder 13. slide. On the other hand, a lower flange plate 22 is provided at a lower end portion of the inner cylinder 21, and a support fixing sheave 35 to be described later is attached to the lower flange plate 22.

Reference numeral 23 denotes a second-stage inner cylinder that is movably accommodated at the innermost position with an appropriate gap therebetween with the inner side of the first inner cylinder 21. This inner cylinder 23 is formed by a rear side surface 23A, a front side surface 23B, a left side surface 23C, and a right side surface 23D. The second stage inner cylinder 23 is formed into a rectangular cylinder having a quadrangular sectional shape smaller than the first inner cylinder 21. The second inner cylinder 23 is housed inside the inner cylinder 21 from the lower end side of the first inner cylinder 21, and is movable in the longitudinal direction (vertical direction) of the inner cylinder 21.

Here, between the inner side surface of the first inner cylinder 21 and the outer side surface of the second inner cylinder 23, a sliding plate (not shown) is provided for allowing the inner cylinder 23 to be along the inner cylinder 21 Smooth and smooth sliding. On the other hand, a mounting eye ring 24 is provided at the lower end portion of the inner tube 23, and a clamshell type grab 43 to be described later is attached to the mounting eye ring 24.

Next, the telescopic cylinder 25 of the present embodiment, the pipe guide 26 attached to the telescopic cylinder 25, the sheave mounting rail 28, and the groove will be described. Wheel mounting tools 30 and so on.

Reference numeral 25 denotes a telescopic cylinder disposed along the longitudinal direction of the outer cylinder 13 constituting the telescopic arm 12. The telescopic cylinder 25 is a hydraulic cylinder that can be expanded and contracted by supplying or discharging hydraulic oil. The telescopic cylinder 25 is composed of a pipe 25A and a piston (not shown) slidably provided in the pipe 25A, one side of which is fixed to the piston in the pipe 25A, and the other side is the pipe 25A. It is formed by the rod 25B that protrudes to the outside.

Here, the telescopic cylinder 25 is on the side of the rear side 13A of the outer cylinder 13 on which the crane boom bracket 17 is provided, and is located at the center position of the outer cylinder 13 in the left-right direction, and is arranged such that the rod 25B faces The state on the top. As shown in Fig. 8, the distal end portion 25C of the rod 25B of the telescopic cylinder 25 is coupled to the bracket 13J provided at the side of the upper end portion 13G of the outer cylinder 13 by the plug 25D.

On the other hand, the pipe 25A of the telescopic cylinder 25 extends downward as a free end, and is disposed in a gap 17B formed between the crane boom brackets 17 that form a pair in the left-right direction. Further, on the upper side of the pipe member 25A, a sheave attachment 30 to be described later is attached. Therefore, by expanding and contracting the telescopic cylinder 25 between the most extended state shown in FIG. 1 and the most reduced state shown in FIG. 2, the pipe 25A can be along the outer cylinder 13 along with the sheave attachment 30. Move up and down.

Here, when the telescopic cylinder 25 is reduced to the most reduced state as shown in FIG. 2, the length dimension from the bottom portion 25A1 of the pipe 25A to the front end portion 25C of the rod member 25B (the position of the plug 25D) is minimized. The length dimension of the telescopic cylinder 25 in the state is L1, and it is assumed from the outside When the length of the upper end portion 13G1 of the tube 13 (the position at which the rod 25B is connected to the pin 25D of the outer tube 13) and the length of the lower end portion 13H (the length of the outer tube 13) is L2, the expansion and contraction in the most reduced state The length dimension L1 of the cylinder 25 is set to be approximately 1/2 of the length dimension L2 of the outer cylinder 13.

In other words, the length dimension L1 of the telescopic cylinder 25 and the length dimension L2 of the outer cylinder 13 in the most reduced state are set in the relationship shown by the following formula (1).

More preferably, the length dimension L1 of the telescopic cylinder 25 and the length dimension L2 of the outer cylinder 13 in the most reduced state are set in the relationship shown by the following formula (2).

By setting the length L1 of the telescopic cylinder 25 in the most reduced state to the length dimension of nearly 1/2 of the length dimension L2 of the outer cylinder 13 in this manner, it is possible to be within the range of the length dimension L2 of the outer cylinder 13 The extension of the telescopic cylinder 25 is maximized, and the stroke of the telescopic cylinder 25 can be largely ensured. In this way, the telescopic cable 34 is wound between the telescopic fixed sheave unit 31 and the telescopic movable sheave unit 33, which will be described later. By hanging four times, the telescopic arm 12 can be caused to expand and contract between the most reduced state shown in Fig. 1 and the most extended state shown in Fig. 2.

Further, when the telescopic cylinder 25 is in the most reduced state as shown in Fig. 2, the bottom portion 25A1 of the pipe 25A is located above the pin 20 of the joint portion of the cylinder bracket 19 and the excavating device swing cylinder 4B. position. On the other hand, when the telescopic cylinder 25 becomes the most extended state shown in Fig. 1, the bottom portion 25A1 of the pipe 25A is located below the bolt 18 of the crane boom bracket 17 and the crane boom 4, that is, the bolt 18 position.

When the telescopic cylinder 25 is caused to expand and contract between the most reduced state and the most extended state in this manner, the bottom portion 25A1 of the pipe 25A of the telescopic cylinder 25 will be the crane boom bracket 17 and the pressure cylinder provided in the outer cylinder 13. Since the position of the bracket 19 is moved upward and downward as a reference, the operation of the telescopic cylinder 25 can be made more stable.

Reference numeral 26 denotes a pipe guide provided outside the rear side surface 13A of the outer cylinder 13, and the pipe guide 26 is a pipe 25A that movably houses the telescopic cylinder 25. As shown in Fig. 12 and Fig. 13, the pipe guide member 26 is formed by a corner cylinder having a substantially square sectional shape. The pipe guide 26 is disposed in the gap 17B formed between the pair of crane boom brackets 17, and is fixed to the rear side surface 13A along the longitudinal direction of the outer cylinder 13. Therefore, the pipe 25A which is the free end of the telescopic cylinder 25 can be moved toward the longitudinal direction of the outer cylinder 13 while being guided by the pipe guide 26.

A slide plate 27 is provided on the outer side surface of the bottom side of the pipe 25A of the telescopic cylinder 25. The pipe 25A of the telescopic cylinder 25 is embedded in the pipe guide On the inner peripheral side of the guide member 26, the slide plate 27 is moved along the inner side surface of the pipe guide 26. In this way, the pipe 25A can smoothly and smoothly move along the pipe guide 26 in the longitudinal direction of the outer cylinder 13.

Reference numeral 28 denotes two sheave attachment rails provided on the outer side of the outer cylinder 13, and each of the sheave attachment rails 28 is for guiding a sheave attachment 30 to be described later. The two sheave attachment rails 28 are disposed on the rear side surface 13A of the outer cylinder 13 with a telescopic cylinder 25 interposed therebetween and one on each of the right and left sides.

Here, the sheave attachment rail 28 is formed by a rectangular cylinder having a rectangular cross-sectional shape. The upper end portion of the sheave attachment rail 28 is fixed to the upper end portion 13G of the outer cylinder 13 by the bracket 28A, and the lower end portion of the sheave attachment rail 28 is fixed to the outer cylinder by the bracket 28B. 13 is adjacent to the upper flange plate 14. As a result, the sheave attachment rail 28 is kept at a constant interval from the rear side surface 13A of the outer cylinder 13, and extends in the longitudinal direction in parallel with the rear side surface 13A. In this case, the two sheave attachment rails 28 composed of the corner cylinders are fixed to the outer cylinder 13, so that the strength of the outer cylinder 13 can be increased.

29 is a sheave mounting board that is fixed to the upper end portion 13G of the outer cylinder 13, and the sheave mounting board 29 is attached to the substrate by a telescopic fixed sheave unit 31, 31' or the like which will be described later. Here, the sheave mounting board 29 is provided with a sheave attachment portion 29A that projects from the rear side surface 13A of the outer cylinder 13 toward the rear side (the crane boom 4 side), and is located on the front side of the sheave mounting portion 29A. The cable lock portion 29B. Mounting the substrate 29 on the sheave The sheave attachment portion 29A rotatably supports the telescopic fixing sheave units 31, 31', and the cable locking portion 29B is one end 34A, 34A of the telescopic cables 34, 34' to be described later. 'The card is here.

Reference numeral 30 denotes a sheave attachment to be attached to the pipe 25A of the telescopic cylinder 25, and the sheave attachment 30 is for attaching the movable sheave units 33 and 33' for expansion and contraction and the movable sheaves 41 and 41 for pushing out. '. Here, as shown in FIGS. 7 , 12 , and 13 , the sheave attachment 30 is provided by the main body portion 30A fixed to the upper side of the pipe 25A of the telescopic cylinder 25, and located at the main body portion 30A. The upper side of the main body portion 30A is rotatably supported by the upper side sheave support portion 30B of the telescopic movable sheave units 33, 33', and rotatably supports the push-out movable sheaves 41, 41' to be described later. The lower sheave support portion 30C is formed. The body portion 30A of the sheave attachment 30 is bent into a mountain shape to avoid the pipe guide 26.

On the other hand, as shown in Fig. 12, the main body portion 30A of the sheave attachment 30 is provided with a left-right and right guide insertion portion 30D for the left and right sheaves. The guide rail 28 is slidably inserted into the left and right guide insertion portions 30D, and the sheave attachment 30 can receive the guide of the left and right sheave attachment rails 28 while being in the longitudinal direction of the outer cylinder 13. Move in the up and down direction.

Next, a description will be given of a structure for telescopically coupling the outer cylinder 13 constituting the telescopic arm 12 with the first inner cylinder 21 and the second inner cylinder 23, that is, the fixed sheave for telescopic expansion. Units 31, 31', movable sheave units 33, 33' for telescopic expansion, and telescopic ropes 34, 34', supporting fixed sheaves 35, 35', and supporting cables 37, 37'.

Here, the telescopic fixed sheave units 31 and 31', the telescopic movable sheave units 33 and 33', the telescopic cables 34 and 34', the supporting fixed sheaves 35 and 35', and the supporting cables 37 and 37' It is provided in the outer cylinder 13 so as to be bilaterally symmetrical with the telescopic cylinders 25 interposed therebetween, and has the same structure. Therefore, in the following description, only the telescopic fixed sheave unit 31, the telescopic movable sheave unit 33, the telescopic cable 34, the supporting fixed sheave 35, and the supporting cable 37 which are disposed on the left side of the outer cylinder 13 are provided. In the description of the same member disposed on the right side, a single suffix "'" is added to the component symbol of the corresponding member, and the description thereof is omitted.

31 is a telescopic fixed sheave unit that is fixed to the upper end side of the outer cylinder 13 by the sheave mounting board 29, and the unit for the telescopic fixing sheave 31 is made up of two fixed sheaves 31A and 31B having the same diameter. Constituted. As shown in Fig. 8, one of the fixed sheaves 31A is rotatably supported by a bracket 32A provided on one of the brackets 32 of the sheave mounting portion 29A of the sheave mounting board 29, and the other One of the fixed sheaves 31B is rotatably supported by the other bracket 32B. In this case, the support shafts (not shown) of the respective fixed sheaves 31A and 31B are arranged such that the rear side faces 13A of the outer cylinder 13 are not kept parallel.

Reference numeral 33 denotes a movable sheave unit for expansion and contraction that is rotatably supported by the sheave attachment 30. The movable sheave unit 33 for telescopic movement is composed of The two movable sheaves 33A, 33B of equal diameter are formed. Here, as shown in Fig. 12, one of the movable sheaves 33A and the other movable sheave 33B are adjacent to each other and rotatably supported by the upper sheave mounted on the sheave attachment 30. One of the support portions 30B is supported on the shaft 33C. In this case, the support shaft 33C of each of the movable sheaves 33A and 33B is disposed in a state in which the rear side surface 13A of the outer cylinder 13 is kept parallel. Since the telescopic movable sheave unit 33 is engaged with the expansion and contraction of the telescopic cylinder 25 and the vertical direction of the sheave attachment 30 is moved, the telescopic movable sheave unit 33 approaches or moves away from the telescopic fixed sheave unit 31. .

The telescopic movable sheave unit 33 supported by the sheave attachment 30 is disposed on the outer side of the left side surface 13C of the outer cylinder 13, and is spaced apart from the left side surface 13C by a slight interval in the left-right direction. Oppose each other. In this manner, the phenomenon that the movable sheave unit 33 for expansion and contraction largely protrudes toward the rear side surface 13A side of the outer tube 13 can be suppressed, and the periphery of the movable sheave unit 33 for expansion and contraction can be reduced in size.

Reference numeral 34 denotes a telescopic cable for connecting the outer cylinder 13 and the inner cylinder 23 located at the innermost side, and the telescopic cable 34 is composed of a steel wire rope. Here, as shown in FIG. 9 and FIG. 10, one end 34A of the telescopic cable 34 is a cable locking portion 29B that is locked to the sheave mounting substrate 29 provided on the upper end portion 13G of the outer cylinder 13 The other end 34B of the telescopic cable 34 is locked to the upper side of the second inner cylinder 23. Further, the intermediate portion of the telescopic cable 34 is the two fixed sheaves 31A and 31B that constitute the expansion/contraction fixed sheave unit 31, and the extension thereof. The two movable sheaves 33A and 33B of the movable sheave unit 33 are contracted four times.

In other words, the one end 34A of the telescopic cable 34 is locked to the sheave mounting board 29, and the intermediate portion of the telescopic cable 34 is sequentially wound around one of the movable sheave units 33A of the telescopic movable sheave unit 33. The fixed sheave 31A of one of the telescopic fixed sheave units 31, the other movable sheave 33B of the telescopic movable sheave unit 33, and the other fixed sheave 31B of the telescopic fixed sheave unit 31. Further, the telescopic cable 34 is inserted from the other fixed sheave 31B of the telescopic fixed sheave unit 31 to the inner side of the outer cylinder 13 and the first inner cylinder 21, and the other end 34B of the telescopic cable 34 is a card. It stops at the upper side of the inner cylinder 23 of the second stage.

In this manner, the telescopic fixed sheave unit 31 is configured by the two fixed sheaves 31A and 31B, and the telescopic movable sheave unit 33 is configured by the two movable sheaves 33A and 33B. Further, the telescopic cable 34 is wound four times in total on the two fixed sheaves 31A, 31B and the two movable sheaves 33A, 33B. According to this aspect, for example, the conventional technique is such that the telescopic cable is wound between the four sheaves of the telescopic fixed sheave and the four sheaves of the telescopic movable sheave, and is wound eight times in total. When the structure is compared, the structure of this type can halve the number of times the telescopic cable 34 contacts the sheave.

35 is a support fixing sheave which is provided in the lower flange plate 22 of the first stage inner cylinder 21. This support fixing sheave 35 is rotatably supported by a bracket 36 that is fixed to the lower flange plate 22 of the inner cylinder 21.

Reference numeral 37 denotes a support wire for supporting the inner tube 21 between the outer tube 13 and the inner tube 23, and the support cable 37 is composed of a steel wire cable. Here, as shown in Fig. 9 and Fig. 10, one end 37A of the support cable 37 is locked to the lower flange plate 15 of the outer cylinder 13, and the middle portion of the support cable 37 is wound around the support. The sheave 35 is fixed. Further, the support cable 37 is inserted into the inner side of the first inner cylinder 21 from the support fixed sheave 35, and the other end 37B of the support cable 37 is locked to the upper side of the second inner cylinder 23.

Next, the push-out mechanism 38, 38' which pushes the first-stage inner cylinder 21 in the extending direction when the inner cylinder 21 is extended from the outer cylinder 13 by the telescopic cylinder 25 will be described.

That is, between the outer cylinder 13 and the first inner cylinder 21, left and right ejection mechanisms 38, 38' are provided. Each of the push-out mechanisms 38, 38' is for holding the inner cylinder 21 in an extended state when the inner cylinder 21 is extended from the outer cylinder 13 by the telescopic cylinder 25.

Here, as shown in FIG. 13 and FIG. 14, the push-out mechanisms 38 and 38' are: the push-out fixing sheaves 39 and 39', the push-out movable sheaves 41 and 41', and the push-out cable 42. , 42' constitutes. Each of the push-out mechanisms 38 and 38' is disposed at the center of the telescopic cylinder 25, and is provided in the outer tube 13 symmetrically in the left-right direction, and has the same structure. Therefore, in the following, only the push-out mechanism 38 disposed on the left side of the outer cylinder 13 will be described. For the member disposed on the right side, a single suffix "'" is added to the component symbol of the corresponding member, and the description is omitted. Its description.

39 is a push-out which is provided on the lower side of the outer cylinder 13 Use a fixed sheave. As shown in Fig. 14, the push-out fixing sheave 39 is rotatably supported by the bracket 40 by the support shaft 39A, and the bracket 40 is mounted across the sheave formed on the outer cylinder 13. The opening 16 is fixed to the outer cylinder 13. In this case, the support shaft 39A of the push-out fixing sheave 39 is disposed so as to have an inclination angle of an angle θ smaller than 90 degrees with respect to the left side surface 13C of the outer cylinder 13. In other words, the support shaft 39A for the push-out fixing sheave 39 is disposed so as not to be parallel to the rear side surface 13A of the outer cylinder 13, and a part of the push-out fixing sheave 39 supported by the support shaft 39A is housed. On the inner side of the outer cylinder 13.

41 is a push-out movable sheave that is provided on the sheave attachment 30 at a position lower than the telescopic movable sheave 33. As shown in Fig. 13, the push-out movable sheave 41 is rotatably supported by the lower sheave support portion 30C of the sheave attachment 30 by the support shaft 41A. In this case, the support shaft 41A of the push-out movable sheave 41 is disposed in a state of being kept parallel to the rear side surface 13A of the outer cylinder 13. Since the push-up pulley 41 is moved in the vertical direction in response to the expansion and contraction of the telescopic cylinder 25, the push-out movable sheave 41 approaches or moves away from the push-out fixed sheave 39.

Reference numeral 42 denotes a push-out cable for connecting the outer cylinder 13 and the first-stage inner cylinder 21, and the push-out cable 42 is composed of a steel wire rope. Here, as shown in FIG. 9 and FIG. 10, the one end 42A of the push-out cable 42 is locked to the upper flange plate 14 of the outer cylinder 13, and the intermediate portion of the push-out cable 42 is wound around the push-out. The movable sheave 41 and the push-out fixed sheave 39 are provided. Further, the other end 42B of the push-out cable 42 is The push-out fixing sheave 39 is inserted into the inner side of the outer cylinder 13, and the inner side of the outer cylinder 13 is locked to the upper side of the inner cylinder 21.

Therefore, when the telescopic cylinder 25 is to be reduced from the most extended state shown in FIGS. 1 and 9 to the state shown in FIG. 10, the pipe 25A of the telescopic cylinder 25 will be moved together with the sheave attachment 30. Moving upward, the telescopic movable sheave unit 33 will approach the telescopic fixed sheave unit 31. As a result, the telescopic cable 34 originally wound around the telescopic movable sheave unit 33 and the telescopic fixed sheave unit 31 is released, and the second inner cylinder 23 is used from the outer cylinder 13 by its own weight. Elongate downwards. At this time, the other end 37B of the support cable 37 that is locked to the upper side of the inner cylinder 23 moves downward together with the second inner cylinder 23, so that the first section supported by the support cable 37 is inside. The cartridge 21 is also elongated downward from the outer cylinder 13 by its own weight. As a result, as shown in Fig. 2 and Fig. 10, the pipe 25A will move to the upper limit position, and the telescopic cylinder 25 will reach the most contracted state, so that the telescopic arm 12 will be in the most extended state.

Here, when the sheave attachment 30 is close to the telescopic fixed sheave unit 31, the push-out cable 42 is wound between the push-out movable sheave 41 and the push-out fixed sheave 39, and the push-out cable 42 is used. The other end 42B will move downward together with the first stage inner cylinder 21. As a result, the cable 42 is pushed to maintain a certain tension. Further, since the inner cylinder 21 is extended in a state of being supported by the support cable 37, the support cable 37 also maintains a constant tension.

Therefore, the inner cylinders 21, 23 are extended from the outer cylinder 13 Then, the excavation work is performed by using the clamshell grab 43 described later, whereby even if the excavating reaction force toward the upper side acts on the inner cylinders 21 and 23, the push wire 42 and the support wire 37 can be used. The tension suppresses the movement of the inner cylinders 21 and 23 toward the reduction side.

Next, when the telescopic cylinder 25 is to be extended from the most reduced state shown in FIGS. 2 and 10, the pipe 25A of the telescopic cylinder 25 moves downward together with the sheave attachment 30, and is movable for expansion and contraction. The sheave unit 33 will be moved away from the telescopic fixed sheave unit 31. As a result, the telescopic cable 34 is wound between the telescopic movable sheave unit 33 and the telescopic fixed sheave unit 31, and the second inner cylinder 23 is moved upward to be accommodated in the first section. Inside the barrel 21. At this time, the other end 37B of the supporting wire 37 that is locked to the upper side of the inner tube 23 moves upward together with the inner tube 23, so that the first inner tube 21 supported by the supporting wire 37 is also It moves upward and is housed in the outer cylinder 13. As a result, as shown in Figs. 1 and 9, the pipe 25A will move to the lower limit position, and the telescopic cylinder 25 will become the most extended state, whereby the telescopic arm 12 will be in the most reduced state.

On the other hand, when the telescopic arm 12 is expanded and contracted between the most reduced state and the most extended state, the telescopic fixed sheave unit 31' and the telescopic movable sheave unit 33' are disposed on the right side with the telescopic cylinder 25 interposed therebetween. The telescopic cable 34', the supporting fixed sheave 35', the supporting cable 37', and the push-out fixing sheave 39' constituting the push-out mechanism 38', the push-out movable sheave 41', and the push-out cable 42' are also Perform the same actions as above.

Here, as shown in FIG. 13 and FIG. 14, the outer cylinder 13 is surrounded by the rear side surface 13A, the front side surface 13B, the left side surface 13C, the right side surface 13D, the left inclined surface 13E, and the right inclined surface 13F. The hexagonal cross-sectional shape, the push-out movable sheave 41 is disposed at a position facing the left inclined surface 13E in the left-right direction. Therefore, as shown by the arrow X in Fig. 13, the push-out movable sheave 41 can be disposed so as to be close to the left inclined surface 13E. More preferably, the movable sheave 41 for pushing out is provided at a position equivalent to the left side surface 13C or a position further inside. When the movable sheave 41 is approached to the left inclined surface 13E of the outer cylinder 13 in this manner, the amount of the push-out movable sheave 41 that protrudes in the left-right direction with respect to the left side surface 13C of the outer cylinder 13 can be suppressed. Further, the amount by which the movable sheave 41 for pushing out protrudes in the front-rear direction with respect to the rear side surface 13A of the outer cylinder 13 can be suppressed.

On the other hand, if the push-out movable sheave 41 is disposed in this manner, the support shaft 39A of the push-out fixing sheave 39 of the push-out cable 42 is wound between the push-out movable sheave 41 and the push-out movable sheave 41. The angle θ formed by the left side surface 13C of the outer cylinder 13 can be increased. In this manner, as shown by an arrow Y in FIG. 14, a part of the push-out fixing sheave 39 accommodated in the outer cylinder 13 can be sufficiently separated from the inner cylinder 21. Further, it is possible to reduce the amount of protrusion of the push-out fixing sheave 39 from the left side surface 13C. As a result, it is not necessary to increase the size between the left and right side faces 13C, 13D of the outer cylinder 13, so that a sufficient interval between the push-out fixing sheave 39 and the first-stage inner cylinder 21 can be ensured without By letting the two interfere with each other, the entire telescopic arm 12 can be made very compact. Such a knot The same applies to the push-out movable sheave 41' and the push-out cable 42' which are disposed on the right side with the telescopic cylinder 25 interposed therebetween.

43 is a clamshell type grab that is attached to the attachment eye ring 24 provided on the distal end side (lower end side) of the inner tube 23 in a swingable manner. By expanding and contracting the grab cylinder 44, the clamshell grab 43 can be caused to open and close to perform the excavation work of the soil sand.

The deep excavation type excavator 1 of the present embodiment has the above-described configuration, and an operation of excavating the vertical pit 101 for the floor 100 intended to be deep-excavated using the excavation type excavator 1 will be described below.

First, as shown in Fig. 1, the deep excavation type excavator 1 urges the telescopic cylinder 25 to be the most elongated to bring the telescopic arm 12 into the most reduced state, and the telescopic arm 12 is moved with respect to the ground 100 intended to excavate the vertical pit 101. Keep it in a vertical position.

Next, as shown in Fig. 2, the telescopic cylinder 25 is caused to be contracted so that the telescopic arm 12 is in an extended state. In other words, the pipe 25A of the telescopic cylinder 25 is caused to move upward together with the sheave attachment 30, and the telescopic movable sheave unit 33 is urged to approach the telescopic fixed sheave unit 31. In this manner, the two expansion sheaves 33A and 33B that are originally wound around the telescopic movable sheave unit 33 and the two telescopic ropes 31A and 31B of the telescopic fixed sheave unit 31 are released. come out. As a result, the second-stage inner cylinder 23 is extended downward from the outer cylinder 13 by its own weight, and the first-stage inner cylinder 21 supported by the support cable 37 is also used from the outer cylinder 13 by its own weight. Elongate downwards.

At this time, the push-out supported by the sheave attachment 30 is used. The push-out cable 42 is taken up between the movable sheave 41 and the push-out fixed sheave 39, so that the push-out cable 42 can be kept at a constant tension at all times. Further, the support cable 37 for supporting the first inner cylinder 21 between the outer cylinder 13 and the second inner cylinder 23 also maintains a constant tension.

As a result, the inner cylinders 21 and 23 can be held in the state of being extended from the outer cylinder 13 by the tension of the pushing cable 42 and the supporting cable 37, and the clamshell grab 43 can be pressed toward the bottom surface 102 of the vertical pit 101. Go in. In this state, the grabbing cylinder 44 is used to cause the clamshell grab 43 to open and close, and the clamshell grab 43 can be used to excavate the vertical pit 101, which can be grasped by the clamshell type. Bucket 43 digs a lot of soil sand.

After the soil sand is excavated by the clamshell grab 43, the telescopic cylinder 25 is caused to extend, so that the pipe 25A of the telescopic cylinder 25 moves downward together with the sheave attachment 30, so that the movable sheave unit 33 for telescopic expansion can be used for expansion and contraction. The fixed sheave unit 31 is separated.

In this manner, the telescopic cable 34 is wound between the movable sheaves 33A and 33B of the telescopic movable sheave unit 33 and the fixed sheaves 31A and 31B of the telescopic fixed sheave unit 31, and the inner cylinder 23 It moves upward and is housed in the inner cylinder 21. At this time, the other end 37B of the support cable 37 for connecting the outer cylinder 13 and the inner cylinder 23 is moved upward together with the inner cylinder 23, so that the inner cylinder 21 supported by the support cable 37 is also It moves upward and is housed in the outer cylinder 13. As a result, the telescopic arm 12 again becomes the most reduced state as shown in FIG.

Next, as shown in Fig. 1, the telescopic cylinder 25 reaches the most extended state, and after the telescopic arm 12 is in the most reduced state, the front end side of the crane boom 4 is lifted upward, and the clamshell grab 43 is removed. The vertical pit 101 is pulled out. Then, the lower traveling body 2 is maintained in a stopped state, and the upper revolving body 3 is caused to swing toward a predetermined earthing position, and then the earth sand held by the clamshell grab 43 is discharged to the earthing position.

Here, according to the excavation type excavator 1 of the present embodiment, the telescopic fixed sheave unit 31 is constituted by two fixed sheaves 31A and 31B, and the movable sheave unit 33 for expansion and contraction is composed of two movable grooves. The wheels 33A, 33B are constructed. Further, the telescopic cable 34 is wound four times in total on the two fixed sheaves 31A and 31B and the two movable sheaves 33A and 33B. As a result, in a structure in which the telescopic cable is wound eight times in total between the four sheaves of the telescopic fixed sheave unit and the four sheaves of the telescopic movable sheave unit, for example, in the prior art, By comparison, the number of times the telescopic cable 34 is brought into contact with each of the fixed sheaves 31A and 31B and the movable sheaves 33A and 33B can be halved, so that the life of the telescopic cable 34 can be extended.

In this case, the telescopic cable 34 disposed on the left side with the telescopic cylinder 25 interposed therebetween is wound four times on the two fixed sheaves 31A and 31B and the two movable sheaves 33A and 33B. The telescopic cable 34' disposed on the right side of the cylinder 25 is wound four times on the two fixed sheaves 31A', 31B' and the two movable sheaves 33A', 33B'. As a result, in four fixed sheaves and four movable bodies with, for example, the prior art Comparing the large-scale structure of the telescopic cable to the telescopic cable for eight times between the sheaves, the telescopic cable 34, 34' can be more closely arranged to the left of the outer cylinder 13 , right side.

In addition, when one of the left and right telescopic cables 34 and 34' is broken while the telescopic cylinder 25 is interposed therebetween, the inner cylinder 23 can be supported by the other telescopic cable, so that excavation can be ensured. The safety of the work.

Further, the telescopic cable 34 is wound four times between the two fixed sheaves 31A and 31B constituting the expansion/contraction fixed sheave unit 31 and the two movable sheaves 33A and 33B that constitute the expansion/contractable sheave unit 33. . As a result, the pull-up amount of the inner cylinders 21 and 23 using the telescopic cable 34 can be made four times as large as the stroke of the telescopic cylinder 25, and the inner cylinders 21 and 23 can be efficiently pulled up.

On the other hand, in the deep excavation type excavator 1 of the present embodiment, the length dimension L1 when the telescopic cylinder 25 is in the most reduced state is set to a length of approximately 1/2 of the length dimension L2 of the outer cylinder 13. Therefore, in the range of the length L2 of the outer cylinder 13, the telescopic cylinder 25 can be maximally extended, and the stroke of the telescopic cylinder 25 can be largely ensured. As a result, the telescopic cable 34 is wound between the two fixed sheaves 31A and 31B of the telescopic fixed sheave unit 31 and the two movable sheaves 33A and 33B of the telescopic movable sheave unit 33. Then, the telescopic arm 12 can be expanded and contracted between the most reduced state shown in Fig. 1 and the most extended state shown in Fig. 2.

Deep excavation type excavator 1 according to the present embodiment, telescopic cylinder The front end portion 25C of the rod member 25B of 25 is pivotally coupled to the bracket 13J provided in the outer tube 13 of the telescopic arm 12 by using the pin 25D. On the other hand, the sheave attachment 30 for supporting the movable sheave unit 33 for stretching and the movable sheave 41 for pushing out is the pipe member 25A attached to the telescopic cylinder 25 as a free end. Therefore, when the expansion cylinder 25 is elongated in order to lift the soil sand excavated by the clamshell grab 43, the pipe 25A which is itself a weight will move downward together with the sheave attachment 30.

As a result, the telescopic cable 34 wound around the telescopic movable sheave unit 33 and the telescopic fixed sheave unit 31 receives the downward load generated by the weight of the pipe 25A and the sheave attachment 30. As a result, the telescopic arm 12 can increase the pulling-up force for pulling up the inner cylinders 21 and 23 by the weight of the pipe 25A and the sheave attachment 30, and can more efficiently execute the force telescopic cylinder 25 to the inner cylinder. 21, 23 up the action.

According to the present embodiment, the rod member 25B of the telescopic cylinder 25 is fixed to the upper side of the outer cylinder 13 at a position lower than the telescopic fixing sheave 31. In this manner, the pipe 25A to which the telescopic cylinder 25 of the sheave attachment 30 is attached is movable in the vertical direction within a range of the upper half of the outer cylinder 13 that extends in the vertical direction. Therefore, for example, as shown in Fig. 1, when the excavation of the vertical pit 101 is performed, even if the lower half of the outer cylinder 13 has been submerged, the operator located in the cover 3B of the upper revolving body 3 remains The expansion and contraction operation of the telescopic cylinder 25 and the like can be confirmed visually. As a result, the workability and safety of excavating work using the excavation type excavator 1 can be improved.

According to the present embodiment, the two sheave attachment rails 28 are fixed to the outer side of the outer cylinder 13 in a state of extending in the longitudinal direction in parallel with the outer cylinder 13. On the other hand, the sheave attachment 30 moves in the longitudinal direction of the outer cylinder 13 along the sheave attachment rail 28 in response to the expansion and contraction of the telescopic cylinder 25.

Therefore, the sheave attachment 30 is guided by the sheave attachment rail 28 and can always move on a certain track. As a result, the telescopic cable 34 that is wound around the telescopic fixed sheave unit 31 and the telescopic movable sheave unit 33 can smoothly and smoothly follow the movement of the telescopic movable sheave unit 33, so that the inner cylinder can be lifted. The stability of the telescopic movement of the outer cylinder 13 of 21 and 23. Moreover, since the two sheave attachment rails 28 are fixed to the outer cylinder 13, the sheave attachment rails 28 can be used to raise the strength of the outer cylinders 13, thereby improving the overall reliability of the telescopic arms 12.

On the other hand, the pipe 25A to which the telescopic cylinder 25 of the sheave attachment 30 is attached can be moved along a sheave attachment rail 28 on a certain track. As a result, the anti-frustration strength and the strength against the lateral load of the telescopic cylinder 25 can be improved, and the reliability of the telescopic cylinder 25 can be improved.

According to the present embodiment, the pair of crane boom brackets 17 are provided on the rear side surface 13A of the outer cylinder 13 on the side of the lid body 3B of the upper revolving body 3, and the pair of crane boom brackets 17 are mounted on the crane boom The front end side of 4. Further, the telescopic cylinder 25 is disposed between the pair of crane boom brackets 17.

In this way, the sheave attachment 30 attached to the pipe 25A of the telescopic cylinder 25, the telescopic movable sheave unit 33 supported by the sheave attachment 30, and the telescopic fixed sheave unit 31 can be wound. The telescopic cable 34 or the like of the movable sheave unit 33 for expansion and contracting is disposed at a position facing the lid body 3B of the upper revolving body 3. As a result, the operator in the lid body 3B can control the inner cylinders 21 and 23 to expand and contract the outer cylinder 13 while visually recognizing the telescopic cylinder 25 or the like, and can reliably perform the manipulation of the expansion and contraction operation.

Since the crane boom bracket 17 is provided on the rear side surface 13A of the outer cylinder 13, it is not necessary to provide the telescopic cylinder 25, the telescopic fixed sheave unit 31, the sheave attachment 30, and the movable sheave unit 33 for expansion and contraction. The front side 13B of the barrel 13. Therefore, when the excavation of the vertical pit 101 is performed, members such as the telescopic cylinders 25 do not collide with the obstacle and are damaged, and the workability of the excavation work can be improved.

On the other hand, as shown in Fig. 15, the crane boom bracket 17 is provided on the rear side surface 13A of the outer cylinder 13, so that the front of the outer cylinder 13 can be changed in order to change the deep excavator 1 into a conveying posture. The side 13B is placed on the ground. In this way, the telescopic cylinder 25, the sheave attachment 30, the telescopic fixed sheave unit 31, the telescopic movable sheave unit 33, and the like can be held in an upward posture without using a mounting table or the like. And there is no weight on the telescopic arm 12 acting on it.

Therefore, in the state where the deep excavation type excavator 1 is changed to the conveyance posture, the telescopic cylinder 25 attached to the outer cylinder 13, the telescopic fixed sheave unit 31, the sheave attachment 30, and the movable sheave for expansion and contraction are required. single When the maintenance work is performed by the unit 33 or the like, it can be carried out at a position close to the ground, so that the workability of the maintenance work can be improved.

According to the present embodiment, the cylindrical tubular guide 26 is provided on the rear side surface 13A of the outer cylinder 13, and the tubing of the telescopic cylinder 25 can be accommodated in the tubular guide 26 in a movable (sliding) manner. 25A. In this way, the pipe 25A of the telescopic cylinder 25 as the free end can be guided by the pipe guide 26 in the longitudinal direction of the outer cylinder 13. Therefore, even if the sheave attachment 30 is mounted on the pipe 25A, this pipe 25A can be smoothly and smoothly moved along the pipe guide 26.

Moreover, the tube 25A of the telescopic cylinder 25 can be moved along a certain direction of the rail along the pipe guide 26, so that the anti-frustration strength and the strength against the lateral load of the telescopic cylinder 25 can be improved. Further, by accommodating the pipe member 25A in the pipe guide 26, the pipe member 25A can be protected from the falling rock or the like at the time of excavation work of the vertical pit 101.

According to the present embodiment, the outer cylinder 13 is formed in a tubular shape having a hexagonal cross-sectional shape, and the outer cylinder 13 is disposed between the rear side surface 13A and the left and right side surfaces 13C and 13D, and is provided with left and right sides. Inclined faces 13E, 13F. As a result, the frustration strength against the load acting on the outer cylinder 13 can be increased, and the life of the outer cylinder 13 can be prolonged, so that the overall reliability of the telescopic arm 12 can be improved.

Further, since the movable sheave unit 33 for stretching and contracting is disposed outside the left side surface 13C of the outer cylinder 13, the movable sheave unit 33 for expansion and contraction and the left side surface 13C of the outer cylinder 13 are spaced apart from each other by a slight interval. left The opposite side in the right direction. In this manner, the movable sheave unit 33 for expansion and contraction can be prevented from largely protruding toward the side of the rear side surface 13A of the outer tube 13, and even when the movable sheaves 33A and 33B having a large diameter are used, the expansion and contraction can be used. The periphery of the movable sheave unit 33 is miniaturized. As a result, the life of the telescopic cable 34 can be extended by using the movable sheave unit 33 for expansion and contraction of the movable sheaves 33A and 33B having a large diameter. Further, the movable sheave unit 33' for stretching and contracting is disposed further outward than the right side surface 13D of the outer cylinder 13, so that the same effects as described above can be obtained.

In the deep excavation type excavator 1 of the present embodiment, the structure for extending the life of the telescopic cable 34 can be extended. Therefore, the load acting on the telescopic cable 34 can be set to be larger. As a result, the second inner cylinder 23 connected to the telescopic cable 34 can be used to pull up a larger load, and the capacity of the clamshell type grab 43 attached to the front end side of the inner cylinder 23 can be increased. Excavation of a large amount of soil sand to improve the efficiency of excavation.

Further, according to the excavation type excavator 1 of the present embodiment, the sheave mounting openings 16 and 16' are provided on the lower side of the outer cylinder 13, and a part of the push-out fixing sheaves 39 and 39' is mounted by the sheave. The openings 16, 16' are disposed inside the outer cylinder 13. In this way, even when the diameters of the push-out fixing sheaves 39, 39' are made large, the push-out fixing sheaves 39, 39' can be attached to the outer cylinder 13 very tightly. As a result, the life of the push-out wires 42, 42' can be extended by using the push-out fixing sheaves 39, 39' having a larger diameter.

Moreover, the push-out fixing sheaves 39, 39' are arranged Since the positions of the sheave mounting openings 16 and 16' on the lower side of the outer cylinder 13 are arranged, it is not necessary to arrange the push-out fixing sheaves at the lower end portion of the outer cylinder as in the prior art. In this manner, even when the first inner cylinder 21 is housed in the outer cylinder 13, the lower flange plate 22 provided at the lower end portion of the inner cylinder 21 does not occur with the push-out fixing sheaves 39, 39'. collision. Therefore, the lower flange plate 22 of the inner cylinder 21 can be brought close to the lower end portion 13H of the outer cylinder 13 (that is, beside the lower flange plate 15). As a result, the total length when the telescopic boom 12 is in the most reduced state can be further shortened. For example, when the deep excavation type excavator 1 is transported, it can be held in a compact transport posture.

Further, the configuration of the example described in the above embodiment is a telescopic cylinder 25, a sheave attachment rail 28, a sheave attachment 30, a telescopic fixed sheave unit 31, and a telescopic movable sheave unit 33. Then, it is disposed on the side of the rear side surface 13A on which the crane boom bracket 17 is attached, among the outer cylinders 13 constituting the telescopic arm 12. However, the present invention is not limited thereto, and such a configuration as that of the modification shown in Fig. 16 can be produced. In other words, the telescopic cylinder 25, the sheave attachment rail 28, the sheave attachment 30, the telescopic fixed sheave unit 31, the telescopic movable sheave unit 33, and the like may be disposed in front of the outer cylinder 13. The structure on the side of the side 13B. In this way, for an operator who has been accustomed to the conventional telescopic boom, it is not uncomfortable to operate the deep excavator, and the operability can be improved.

Further, in the example given in the above embodiment, the sheave attachment rail 28 for guiding the sheave attachment 30 is formed by a rectangular cylinder having a rectangular cross-sectional shape. However, the structure of the present invention The present invention is not limited thereto, and for example, a sheave attachment rail may be formed of a steel material having an L-shaped cross-sectional shape.

11‧‧‧Multi-section telescopic arm device

12‧‧‧ Telescopic arm

13‧‧‧Outer tube

13C‧‧‧Left side

13J‧‧‧ bracket

14‧‧‧Upper flange plate

15‧‧‧ Lower flange plate

16‧‧‧ Openings for sheave installation

17‧‧‧ Crane boom bracket

17A‧‧‧ Crane boom joint

19‧‧‧Cylinder bracket

21‧‧‧The first inner tube

22‧‧‧ Lower flange plate

23‧‧‧The second inner cylinder

25‧‧‧ Telescopic cylinder

25A‧‧‧Tubing

25B‧‧‧ rods

25C‧‧‧ front end of the rod

26‧‧‧Tube guides

28‧‧‧Slotted wheel mounting rails

28A‧‧‧ bracket

29‧‧‧Slot wheel mounting substrate

29A‧‧‧Slot wheel installation

29B‧‧‧Steel cable lock

30‧‧‧Slot wheel mounting tools

30A‧‧‧ Body Department

30B‧‧‧Upper sheave support

30C‧‧‧Bottom sheave support

31, 31'‧‧‧Fixed fixed sheave

31A, 31A'‧‧‧ fixed sheave

31B, 31B'‧‧‧ fixed sheave

32A‧‧‧ bracket

32B’‧‧‧ bracket

33, 33'‧‧‧Removable sheave for telescopic

33A, 33A'‧‧‧ movable trough

33B, 33B’‧‧‧ movable trough

34, 34'‧‧‧ Telescopic cable

34A, 34A'‧‧‧ One end of a telescopic cable

35, 35'‧‧‧Support fixed sheave

36, 36’‧‧‧ bracket

37, 37'‧‧‧Support cable

37A, 37A'‧‧‧ one end of the support cable 37

38‧‧‧ Launching agency

39‧‧‧ Launched with fixed sheave

40‧‧‧ bracket

41, 41'‧‧‧ Launched with movable sheave

42, 42’‧‧‧ Launched steel cable

42A, 42A’‧‧‧ launched one end of the steel cable

Claims (12)

A multi-stage telescopic boom device is provided with an outer cylinder (13) provided on a front end side of a crane boom (4) to be mounted, and is housed in the outer cylinder (13) so as to extend in the vertical direction a telescopic arm (12) of a plurality of inner cylinders (21, 23) that can expand and contract in the longitudinal direction, and a telescopic cylinder (25) disposed along a longitudinal direction of the outer cylinder (13) constituting the telescopic arm (12) a fixed-fixing sheave unit (31, 31') that is fixedly disposed to the left and right of the outer cylinder (13); so as to be accessible to or away from the aforementioned fixed-fixing sheave units (31, 31') a trough mounting device (30) that is mounted on the telescopic cylinder (25) and movable in the longitudinal direction of the outer cylinder (13); and is disposed on the left and right sides of the sheave mounting device (30) a movable sheave unit (33, 33') for telescoping; one end side thereof is locked to the outer cylinder (13), and the other end side thereof is locked in the innermost side of the inner cylinder (21, 23) The inner cylinder (23) is wound around the left and right of each of the above-described telescopic fixed sheave units (31, 31') and each of the above-described telescopic movable sheave units (33, 33'). A multi-stage telescopic boom device comprising a telescopic cable (34, 34'), wherein each of the telescopic fixed sheave units (31, 31') is composed of two sheaves (31A, 31B), respectively (31A) ', 31B'), each of the above-described expansion and contraction movable sheave units (33, 33') is composed of two sheaves (33A, 33B), (33A', 33B'), and each of the above-mentioned expansion and contraction The steel cable (34, 34') is used for each of the above-described telescopic fixed sheave units (31, 31') and each of the above-described movable and movable movable sheave units Between (33, 33'), it is hung four times. The multi-stage telescopic boom device according to claim 1, wherein the outer cylinder (13) is provided with a crane boom bracket having a joint portion for connecting the crane boom (4) ( 17) having a swing cylinder that is disposed above or below the crane boom bracket (17) with an interval therebetween, and is provided with a swing cylinder that allows the telescopic arm (12) to swing the crane boom (4) ( 4B) a cylinder bracket (19) for connecting the connecting portion; the telescopic cylinder (25) has a pipe (25A), one side of which is fixed to the piston in the pipe (25A), and the other side thereof a rod member (25B) protruding outward from the tube (25A), and mounting the aforementioned sheave attachment (30) on one of the tube (25A) and the rod (25B); the telescopic cylinder (25), When it is in the most reduced state, the end of one of the tube (25A) and the rod (25B) is located in comparison with the aforementioned crane boom bracket (17) and the aforementioned cylinder bracket (19). The connecting portion of the upper bracket is further above, and when it is in the most extended state, the end of one of the pipe (25A) and the rod (25B) is in position. Compared bracket positioned below the connecting portion of the crane boom bracket (17) and the cylinder bracket (19) downward among others. The multi-stage telescopic arm device according to claim 1, wherein the telescopic cylinder (25) is provided with a pipe (25A), one side of which is fixed to the piston in the pipe (25A), and the other One side is a hydraulic cylinder constructed from the aforementioned pipe (25A) to the outside of the rod (25B) The length dimension (L1) from the bottom portion (25A1) of the pipe (25A) to the front end portion (25C) of the rod member (25B) when the telescopic cylinder (25) is in the most reduced state is It is set to be approximately 1/2 of the length dimension (L2) of the outer cylinder (13). The multi-stage telescopic boom device according to the first aspect of the invention, wherein the front end portion of the rod member (25B) of the telescopic cylinder (25) is attached to the upper side of the outer cylinder (13) in an upward state. The aforementioned sheave attachment (30) is a pipe (25A) attached to the telescopic cylinder (25). The multi-stage telescopic boom device according to the first aspect of the invention, wherein each of the telescopic fixed sheave units (31, 31') is symmetrically arranged bilaterally with the telescopic cylinder (25) interposed therebetween In the outer cylinder (13), each of the telescopic movable sheave units (33, 33') is disposed on the sheave attachment (30) symmetrically with respect to the telescopic cylinder (25). The respective telescopic cables (34, 34') are respectively wound around the sheaves (31A, 31B) of the telescopic fixed sheave unit (31) disposed on the left side with the telescopic cylinder (25) interposed therebetween. a groove that is disposed between the sheave (33A, 33B) of the telescopic movable sheave unit (33) and the telescopic fixed sheave unit (31') that is disposed on the right side with the telescopic cylinder (25) interposed therebetween The wheels (31A', 31B') are interposed between the sheaves (33A', 33B') of the above-described telescopic movable sheave unit (33'). The multi-stage telescopic arm device as described in claim 1 of the patent application, The outer side of the outer cylinder (13) is provided with a sheave attachment rail (28) that is attached to the outer cylinder (13) in a longitudinal direction parallel to the outer cylinder (13); The sheave attachment (30) moves along the aforementioned sheave attachment rail (28) in accordance with the expansion and contraction of the telescopic cylinder (25). The multi-stage telescopic arm device according to claim 1, wherein a pair of cranes are provided on an outer side of the outer cylinder (13) and on a lower side than the sheave attachment (30). a boom bracket (17) that faces in the left-right direction with an interval therebetween, and is attached to be swingable toward a front end side of the crane boom (4); The tubing (25A) of the cylinder (25) is a gap (17B) disposed between the pair of crane boom brackets (17). The multi-stage telescopic arm device according to claim 1, wherein a pipe guiding member (26) is provided on an outer side of the outer cylinder (13), and the pipe guiding member (26) is The pipe (25A) is accommodated in such a manner that the pipe (25A) of the telescopic cylinder (25) moves, and the pipe (25A) is guided in the longitudinal direction of the outer cylinder (13). The multi-stage telescopic arm device according to claim 1, wherein the outer cylinder (13) is formed in a rectangular tube shape having a polygonal cross-sectional shape, and the polygonal cross-sectional shape is angularly cylindrical. At least the front side (13A) mounted on the front end side of the crane boom (4) and the front side opposite to the rear side (13A) in the front-rear direction (13B), a left side surface (13C) and a right side surface (13D) that face each other in the left-right direction with the rear side surface (13A) and the front side surface (13B) interposed, and the rear side surface (13A) and the left side surface (13C) a left inclined surface (13E) that is obliquely disposed obliquely between each other, and a right inclined surface (13F) that is obliquely inclined between the rear side surface (13A) and the right side surface (13D); The movable sheave unit (33, 33') is disposed on the outer side of the left and right side faces (13C, 13D) constituting the outer cylinder (13) in the left-right direction. The multi-stage telescopic boom device according to claim 1, wherein the outer cylinder (13) is formed in a rectangular tubular shape having a hexagonal cross-sectional shape, and the hexagonal cross-sectional shape is a rectangular cylinder shape. It is a rear side surface (13A) attached to the front end side of the crane boom (4), a front side surface (13B) opposed to the rear side surface (13A) in the front-rear direction, and a rear side surface (13A) And a left side surface (13C) and a right side surface (13D) facing the front side surface (13B) in the left-right direction, and a left inclined surface obliquely inclined between the rear side surface (13A) and the left side surface (13C) (13E) is formed by a right inclined surface (13F) which is obliquely arranged obliquely between the rear side surface (13A) and the right side surface (13D). The multi-stage telescopic arm device according to claim 1, wherein the outer cylinder (13) and the inner cylinder (21, 23) of the plurality of sections are located at the outermost first inner cylinder (21) Between the two, there is provided an ejecting mechanism (38, 38') for the aforementioned telescopic cylinder (25) to move the first inner cylinder (21) from the outer cylinder (13) Outreach For a long time, the first inner cylinder (21) is pushed out in the extending direction; the pushing mechanism (38, 38') is located on the lower side of the outer cylinder (13), and is disposed outside the foregoing The push-out fixing sheaves (39, 39') of the left and right sides of the cylinder (13) are disposed at the lower side of the telescopic movable sheave units (33, 33'), and are mounted on the sheave. The push-out movable sheave (41, 41') having the left and right sides of (30) is locked to the outer cylinder (13) at one end side, and the other end side thereof passes through the inner side of the outer cylinder (13). The first inner cylinder (21) is locked, and the middle portion is wound around the left and right push-out fixing sheaves (39, 39') and the left and right push-out movable sheaves (41). 41'), the left and right push-out steel cables (42, 42'); and the left and right push-out fixed sheaves (39, 39) on the lower side of the outer cylinder (13) The position of the ') is provided with a groove mounting opening (16, 16'), and a part of the left and right pushing fixed sheaves (39, 39') is through the aforementioned groove mounting opening (16, 16). ') is disposed in the aforementioned outer cylinder (13) Inside. A deep excavation type excavator, comprising: a self-propelled vehicle body (2, 3), a crane boom (4) provided for the pitching motion of the vehicle body (2, 3), and being disposed at a multi-stage telescopic arm device (11) on the front end side of the crane boom (4), and the multi-stage telescopic arm device (11) includes an outer cylinder (13) extending in the vertical direction and being housed in the outer cylinder ( The inner side of 13) a telescopic arm (12) of a plurality of inner cylinders (21, 23) that expand and contract in the longitudinal direction, and a telescopic cylinder (25) disposed along a longitudinal direction of the outer cylinder (13) constituting the telescopic arm (12) The telescopic fixed sheave units (31, 31') fixed to the left and right of the outer cylinder (13) are attached to the telescopic cylinder (25) so as to be accessible to or away from the telescopic fixing sheaves. The unit (31, 31') is movable in the longitudinal direction of the outer cylinder (13), and is mounted on the left and right of the sheave attachment (30). The sheave unit (33, 33'), one end side thereof is locked to the outer cylinder (13), and the other end side thereof is locked to the innermost inner cylinder among the inner cylinders (21, 23) ( 23) The left and right telescopic cables (34, 34) are wound around the respective telescopic fixed sheave units (31, 31') and the respective telescopic movable sheave units (33, 33'). The above-mentioned each of the above-described expansion and contraction fixed sheave units (31, 31') is composed of two sheaves (31A, 31B) and (31A', 31B'); Movable sheave for each telescopic The elements (33, 33') are respectively composed of two sheaves (33A, 33B), (33A', 33B'); and each of the above-mentioned telescopic cables (34, 34') is used for each of the above-mentioned telescopic The fixed sheave unit (31, 31') is wound four times between the above-described respective movable sheave units (33, 33') for expansion and contraction.